#include"Nguoi.h"
#include"NguoiAnh.h"
#include"NguoiViet.h"
int main(){
	Nguoi *n;
	NguoiViet nv;
	NguoiAnh na;
	n = &nv;
	n->Chao();
	n = &na;
	n->Chao();
	_getch();
	return 0;
}